python scapy.all 文件未找到

Question

I have tried to run my program, and I have tried import scapy then import scapy.all but is will give me the same error. I am using kali-linux if that helps. The code that is causing the error is just from scapy.all import *

This is the full error output:

Traceback (most recent call last):
  File "/home/bradz/test.py", line 24, in <module>
    from scapy.all import send, IP, TCP, ARP
  File "/usr/local/lib/python3.9/dist-packages/scapy/all.py", line 16, in <module>
    from scapy.arch import *
  File "/usr/local/lib/python3.9/dist-packages/scapy/arch/__init__.py", line 27, in <module>
    from scapy.arch.bpf.core import get_if_raw_addr<br/>
  File "/usr/local/lib/python3.9/dist-packages/scapy/arch/bpf/core.py", line 30, in <module>
    LIBC = cdll.LoadLibrary(find_library("libc"))
  File "/usr/lib/python3.9/ctypes/util.py", line 341, in find_library
    _get_soname(_findLib_gcc(name)) or _get_soname(_findLib_ld(name))
  File "/usr/lib/python3.9/ctypes/util.py", line 147, in _findLib_gcc
    if not _is_elf(file):
  File "/usr/lib/python3.9/ctypes/util.py", line 99, in _is_elf
    with open(filename, 'br') as thefile:
FileNotFoundError: [Errno 2] No such file or directory: b'liblibc.a'

Fixed it. You need to go to:

/usr/lib/python3/dist-packages/scapy/arch/bpf/core.py

and edit the line

LIBC = cdll.LoadLibrary(find_library("libc"))

to

LIBC = cdll.LoadLibrary(find_library("c"))

Answer 1

This appears to have been a bug in the library that was fixed 11 days ago :

There is a regression in Python 3.9 with the find_library() function:

 >>> import ctypes.util >>> ctypes.util.find_library("libc") Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/usr/lib/python3.9/ctypes/util.py", line 341, in find_library _get_soname(_findLib_gcc(name)) or _get_soname(_findLib_ld(name)) File "/usr/lib/python3.9/ctypes/util.py", line 147, in _findLib_gcc if not _is_elf(file): File "/usr/lib/python3.9/ctypes/util.py", line 99, in _is_elf with open(filename, 'br') as thefile: FileNotFoundError: [Errno 2] No such file or directory: b'liblibc.a'

A workaround is to use find_library("c") instead. It also works in older versions of Python and that's already what's used in contrib/isotp.py .

Update scapy since you appear to be using a version of scapy that is incompatible with your version of CPython.

---

Actually, it looks like PyPI hasn't been updated yet, so you won't be able to update through pip . You may need to rollback your Python version until it's updated, or manually install the patched scapy version from Github .